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what version / year do you have ?
where in the UK are you ?
how long has it only been running 0.5 ?
any modifications ?
it might be a split pipe, turbo related.
We just got it 2day don't know what version it is it's an M reg WRX,
We are in swindon, wiltshire
Not sure how long as we only just bought it 2day, but when we went 4 a test drive it seemed to want to go
Mods as far as we can see intercooler, dump valve and airfilter.
We hope its a split pipe! And nothing serious as we only just got it 2day! But when your in the car and your giving it some it sounds very airey